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Battery Wake-Up

  • US 20130221947A1
  • Filed: 03/08/2012
  • Published: 08/29/2013
  • Est. Priority Date: 02/28/2012
  • Status: Active Grant
First Claim
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1. A method to fast detect a low voltage in the range of few μ

  • Volts, comprising the following steps;

    (1) providing a circuit comprising input ports for a voltage to be measured, an output port, a pre-amplifier, a buffer amplifier, an arrangement of switches used for calibration of the circuit, an integrator stage with reset function, and a voltage source for calibrating the integrator stage;

    (2) calibrating the pre-amplifier before each measurement of the voltage is performed;

    (3) start calibration of the integrator stage by providing a voltage stimulus from said voltage source to the integrator stage;

    (4) storing the integrated output signal of the integrator stage generated from said calibration voltage measurement;

    (5) setting said switches to perform the voltage measurement;

    (6) storing the integrated output signal of the integrator stage generated from said voltage measurement; and

    (7) generating an output signal of the circuit if a difference between the calibration signal and the measurement signal exceeds a defined level, wherein all errors of the circuit are eliminated by said differentially generated signal.

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